Amongst the following, the most stable complex is:

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[Fe(C2O4)3]3− Explanation: [Fe(C2​O4​)3​]3− is the most stable complex because oxalate ion \ce{(C2O^{2-}_4)} is a bidentate ligand. Bidentate ligands form chelate rings with the metal ion, which increases the stability of the complex due to the chelate effect. The other ligands (H2O, NH3, Cl−) are monodentate ligands and form comparatively less stable complexes.

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